In the following question, select the related letters / number from the given alternatives.
HD : 21 :: GR : ?According to the alphabetical position of the letters,
HD = 8 + 4 = 12; Reverse of 12 is 21;
Similarly,
GR = 7 + 18 = 25; Reverse of 25 is 52.
Hence, 52 is correct answer.